The 13” 2 Post Rack Shelf is a cantilever shelf, compatible with most standard 19" 2 Post server racks and can be mounted up-side-down. This cantilever shelf is made from 16 GA steel and has a weight capacity of 60 lbs (27.3 kgs), allowing it to hold a variety equipment up to 13” deep. This shelf is solid and with flanges facing up.